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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### Sticky: Forum Guidelines: Smart posting behavior pays off

Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

• Replies: 1
• Views: 196,719
07-16-2014, 11:01 AM
2. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 66,733
09-30-2005, 09:44 AM
1. ### how to prove SSE has n-2 degrees of freedom???

make use of matrix or?

• Replies: 4
• Views: 3,895
11-03-2012, 12:01 PM
2. ### Just checking

The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds.What is the minimum weight of...

• Replies: 3
• Views: 5,541
11-03-2012, 10:15 AM
3. ### Winsorizing data

Hi there, I already checked the two other threads about winsorizing, but it didn't solve my problem. I have a dataset for OLS regression and...

• Replies: 2
• Views: 9,005
11-03-2012, 06:07 AM
4. ### uniform distrubution

If x is uniformly distributed over the interval 8 to 12, inclusively (8 ≤ x ≤ 12), then the probability, P(13 ≤ x ≤ 15), is 15-13 = 2 12-8 = 4...

• Replies: 1
• Views: 6,216
11-02-2012, 11:22 PM
5. ### Hypothesis Testing

Hi all, I've got an MCQ question for uni that I'm not sure how to go about :confused:. If anyone could point me in the right direction that would...

• Replies: 2
• Views: 2,880
11-02-2012, 01:37 PM
6. ### Best test for my data?

I've been going in circles trying to figure out the best way to analyze my data. Here goes... I'm studying changes in concentrations of various...

• Replies: 1
• Views: 1,158
11-02-2012, 11:56 AM
7. ### trend spotting

I am a software engineer with a very limited statistics background but the standard engineering math background. While in grad school I did some work...

• Replies: 1
• Views: 2,452
11-02-2012, 10:48 AM
8. ### [Stata] Selecting duplicate rows based on maximum column value

Hi all, I'm currently working on my master thesis, and am trying to select data from a company database. However, in this database sometimes a...

• Replies: 0
• Views: 1,680
11-02-2012, 10:46 AM
9. ### Standard deviations related question...help?

Q. A school social worker is determining eligibility for anxiety management groups at a high school she is employed at. If she is interested in...

• Replies: 3
• Views: 1,901
11-02-2012, 08:50 AM
10. ### Can rolling r-square give a general idea of profitibility trends?

Hello, all. I’m new to statistics and was wondering if anybody can help with a problem that’s been on my mind. I’m interested in analyzing...

• Replies: 0
• Views: 1,514
11-02-2012, 08:14 AM
11. ### Finding probability from distribution of sample means.

A major supermarket regularly receives batches of bottles of lemon juice from The Juice Factory.The supermarket will reject an entire batch if a...

• Replies: 0
• Views: 1,338
11-02-2012, 02:05 AM
12. ### question

In calculating power, what is the difference between n1 ! = n2 and n1 = n2? What does this mean? Can anyone clarify this?

• Replies: 3
• Views: 2,600
11-01-2012, 06:34 PM
13. ### Bias Correction

I'm working with a dataset consisting of just over 2 years of 5 minute data. For roughly 7 months of this time my instrument was not functioning...

• Replies: 2
• Views: 1,220
11-01-2012, 05:20 PM
14. ### Determining value in a wager using predicted win totals?

I offered to help someone out with calculating this and now realize I may have stepped in way over my head. He had calculated projected win totals...

• Replies: 0
• Views: 893
11-01-2012, 04:42 PM
15. ### r squared and f statistic comparison

I have carried out simple linear regression on a number of variables both continuous and categorical (using dummy variables) individually in SPSS. I...

• Replies: 0
• Views: 3,658
11-01-2012, 01:28 PM
16. ### Regression

Hello, Why when regressing future home price change onto the expected change, under traditional Rational expectations theory, the constant should...

• Replies: 2
• Views: 2,424
GIS
11-01-2012, 08:53 AM
17. ### How to interpret test result with different p values?

I am doing an analysis to test whether the observed kurtosis is significantly different from expected kurtosis of a normal distribution. I have...

• Replies: 0
• Views: 1,564
11-01-2012, 06:02 AM
18. ### Multivariate equivalent of a matched pairs t-test?

Hi there, I have a multivariate data set, and I have performed the main analyses on it and am happy with the results. Now, I took duplicate...

• Replies: 3
• Views: 2,158
11-01-2012, 05:49 AM
19. ### Who will win the electoral college?

There are 8 toss up states. The distribution of electoral votes of those states are: 29 18 13 10 9 6 6 4 One candidate requires 33 electoral...

• Replies: 5
• Views: 1,926
10-31-2012, 10:18 PM
20. ### Confusing Sampling Distribution Problem

Ok, I was understanding how to work sampling distribution problems until I came to this one, and I cannot figure out how to do it for the life of me:...

• Replies: 9
• Views: 5,163
10-31-2012, 09:20 PM
21. ### which test could I take?

Hello, I am new here and also I am quite new to statistics and guess I lack very basic things. I hope to get some input here. Let's see ;-) I...

• Replies: 1
• Views: 1,330
10-31-2012, 11:45 AM
22. ### when will Maximum Likelihood Estimation be same as sample mean

hi guys as above, is there a case when mle will be = to sample mean? If yes when? thanks!

• Replies: 1
• Views: 1,598
10-31-2012, 09:05 AM
23. ### urgent help needed please!! Left vs right vs two tail Fisher's Exact test

Dear all, I have an urgent though probably little question and it would be great if you could help me out! (It is for a friend who has to finish...

• Replies: 3
• Views: 3,250
10-31-2012, 07:10 AM
24. ### Maximum Likelihood Estimate for Normal Distribution unknown Mean,known variance

If (x_1, ..., x_n) is a sample from N (\mu, 1), where \mu >= 0 and is unknown, determine the MLE of \mu I can easily compute the MLE for mu when...

• Replies: 2
• Views: 3,486
10-30-2012, 11:24 PM
25. ### Rate per 100,000 persons for a financial quarter - divide annual population by 4?

Hello, How do I calculate the rate per 100,000 persons of something occurring for a quarter of a year? Specifically, If I have a count of...

• Replies: 0
• Views: 1,984
10-30-2012, 10:53 PM
26. ### Finding a PDF using the CDF technique

Hey guys, I'm stuck on a question in my homework assignment and I was wondering if you could push me in the right direction? So here's the question:...

• Replies: 0
• Views: 2,228
10-30-2012, 08:21 PM
27. ### Sampling distribution

Hi, I have to calculate mean and standard deviation of sample means of size 30 (with replacement) from a population of size 87. Its impossible to...

• Replies: 0
• Views: 1,219
10-30-2012, 06:39 PM
28. ### Correlation between normal and exponential

Can anybody give me some pointers to how to compute confidence intervals for Pearson correlation in the case (X,Y) where X is normal and Y is...

• Replies: 0
• Views: 700
10-30-2012, 05:35 PM
29. ### Using loess smoothing with different kinds of predictors

Hey guys, Just throwing this out there in case anyone is familiar. Lets say I have three types of variables: continuous, categorical, and...

• Replies: 0
• Views: 965
10-30-2012, 04:54 PM
30. ### Help with the Continuous Distribution Function (CDF)?

Hey, new to these forums, I was wondering if you guy could help me with a question about the CDF I have. Basically I'm wondering if this CDF: ...

• Replies: 2
• Views: 1,133
10-30-2012, 03:41 PM
31. ### Rampaging somethings in the something something system

i am strugling with the following question i cant seem to get my head around it....the standard deviation of the the masses of 800 blocks is 252kg. A...

• Replies: 0
• Views: 1,192
a.j
10-30-2012, 02:12 PM
32. ### AMOS - fit indices for nonnormal data

Dear all, I've am struggling on a CFA in AMOS conducted on multivariate nonnormal data. I want to identify the factorial structure that best...

• Replies: 3
• Views: 8,942
10-30-2012, 08:04 AM
33. ### How are the correlation coefficient and regression line coefficients related?

For a given r value, say r=0.8: for the regression line equation y=mx+b a) given the value of the slope (m) in the regression line, can the...

• Replies: 2
• Views: 1,543
10-29-2012, 08:50 PM
34. ### Statistics- Probability Help

I am not sure if I am using the normal unit table correctly. I have already done the work, but I don't know which probability is correct. I am not...

• Replies: 1
• Views: 3,512
10-29-2012, 08:29 PM
35. ### Significant results without significant correlation

Hi, I have a weird case - I am finding significant effect (in a regression) for a variable where there is no significant correlation between them....

• Replies: 3
• Views: 1,719
10-29-2012, 08:12 PM
36. ### help with point estimate my attempt follows the question

A marketing research company is estimating which of two soft drinks college students prefer. A random sample of n college students produced the...

• Replies: 0
• Views: 3,148
10-29-2012, 06:47 PM
37. ### Mixed ANOVA: p-Value of within factor increases by adding a between factor...?

Hello, I thought I'm good in math and statistics but this one is giving me a real headache...hope one of the pros here can explain/solve it... ...

• Replies: 1
• Views: 2,443
10-29-2012, 02:43 PM
38. ### The concept behind finding probabilities beyond a 3.4 z score positive or negative

I could really use some assistance. I am taking a stats course for an mba and need to understand the concept behind finding probability for z scores...

• Replies: 5
• Views: 17,869
10-29-2012, 11:56 AM
39. ### Please help "test for ranks"

Dear All, Please help. I am interested to find out if there is any significant difference in the ranks obtained from 3 methods. for example...

• Replies: 2
• Views: 1,893
10-29-2012, 10:58 AM
40. ### multinomial conditional distribution

Hey guys, I'm hoping that one of you can help me out. I'm stuck on a problem. Suppose X = (X_1, ..., X_k) follows a multinomial distribution...

• Replies: 3
• Views: 3,241
BGM
10-29-2012, 10:38 AM
41. ### Additivity of sums of squares in ANOVA

Hello-i have a question (not a homework...but more logical one) For balanced design (where there are equal number of observation in each row/column)...

• Replies: 1
• Views: 1,722
nyo
10-29-2012, 08:56 AM
42. ### Confidence interval, does a difference in sample size affect comparison of results?

I have a time series and im trying to calculate the confidence interval (95%) for the time taken to experience a +ive or -ive move of X%. I would...

• Replies: 1
• Views: 1,934
10-29-2012, 07:39 AM
43. ### How do I show that the Cp statistic, adjusted R, R, and F all give the same rankings?

For a given number of predictors, how can I show that the R^2, adjusted R^2, Cp, and F statistic have the same ranking? I at first thought to make...

• Replies: 0
• Views: 1,067
10-29-2012, 02:15 AM
44. ### Method of Moments and Maximum Likelihood Estimator--- Negative Binomial Distribution

Are the Method of Moments ("MOM") and the Maximum Likelihood Estimator ("MLE") the same for a Negative Binomial Distribution with a sample space of...

• Replies: 0
• Views: 4,597
10-29-2012, 12:26 AM
45. ### Please help!

I cannot figure this question out for the life of me :( A game consists of tossing two coins, first a dime and then a nickel. For each coin which...

• Replies: 0
• Views: 1,518
10-28-2012, 08:12 PM
46. ### The probability of x bar being a certain value (different from E[X] and not normal)

I'm pulling my hair out with this question. It isn't in my notes, my text or in anything I can find online. I'm not sure if I'm having a massive...

• Replies: 2
• Views: 2,953
10-28-2012, 05:55 PM
47. ### Single Correlation coefficient between multiple datarows

Hi, ... and apologies for this probably stupid question - I used to be good at Statistics ages ago but you know how it is if you do not apply stuff...

• Replies: 0
• Views: 1,257
10-28-2012, 03:21 PM
48. ### Help! Which test do I use and how?! *very rusty graduate*

Hi all I have been given some data and I need to do some significance testing on it. The data revolves around food types. Firstly I have been...

• Replies: 2
• Views: 1,252
10-28-2012, 09:39 AM
49. ### Calculating True Score Given Reliability and Total Variance

I've got a question about estimating a true score variance. I'm given the following info: a test contains 20 items, an individual's score was 80,...

• Replies: 0
• Views: 7,182
tk6
10-28-2012, 12:25 AM
50. ### Null hypothesis testing Help please!

A hypothesis test is done to determine whether the mean length of time a rose stays fresh and alive , after given as a gift, is different than 4.5...

• Replies: 0
• Views: 1,414
10-28-2012, 12:10 AM
51. ### Population

How does one find the population in a study?

• Replies: 5
• Views: 1,713
10-27-2012, 10:58 PM
52. ### confidence interval

I have no clue how to answer this: Suppose 100 randomly selected members of Facebook were asked how much time they spend on the site during the...

• Replies: 1
• Views: 2,091
10-27-2012, 09:38 PM
53. ### maximum likelihood of 1+(a/b)cos (theta)

Hello everyone. I am stuck in a problem which is the following. I will explain my problem, then my attempt. The idea is to evaluate an estimator...

• Replies: 6
• Views: 2,597
10-26-2012, 05:24 PM
54. ### Does paired t test need normality of differences?

Hello everyone, I am currently studying statistics so please be patient as my first post is at a quite basic level. I am trying to carry out a...

• Replies: 1
• Views: 2,341
10-26-2012, 11:48 AM
55. ### which method do I have to use??

hi I have 3 dependent and correlate variables and 4 independent my sample is coming from sports, and I want to check if and how my indep.variable...

• Replies: 1
• Views: 1,030
10-26-2012, 07:48 AM
56. ### Two Central Limit Theorem problems [ I have the answers just need help understanding]

1) Acording to AAA the average daily meal and loading cost for a family of four is 213. Assume that the standard devation of such cost is 15....

• Replies: 1
• Views: 1,245
10-26-2012, 02:32 AM

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